| 1 | # getline.m4 serial 15
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| 2 |
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| 3 | dnl Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006 Free Software
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| 4 | dnl Foundation, Inc.
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| 5 | dnl
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| 6 | dnl This file is free software; the Free Software Foundation
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| 7 | dnl gives unlimited permission to copy and/or distribute it,
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| 8 | dnl with or without modifications, as long as this notice is preserved.
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| 9 |
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| 10 | AC_PREREQ(2.52)
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| 11 |
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| 12 | dnl See if there's a working, system-supplied version of the getline function.
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| 13 | dnl We can't just do AC_REPLACE_FUNCS(getline) because some systems
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| 14 | dnl have a function by that name in -linet that doesn't have anything
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| 15 | dnl to do with the function we need.
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| 16 | AC_DEFUN([gl_FUNC_GETLINE],
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| 17 | [
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| 18 | dnl Persuade glibc <stdio.h> to declare getline().
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| 19 | AC_REQUIRE([AC_GNU_SOURCE])
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| 20 |
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| 21 | AC_CHECK_DECLS([getline])
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| 22 |
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| 23 | gl_getline_needs_run_time_check=no
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| 24 | AC_CHECK_FUNC(getline,
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| 25 | dnl Found it in some library. Verify that it works.
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| 26 | gl_getline_needs_run_time_check=yes,
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| 27 | am_cv_func_working_getline=no)
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| 28 | if test $gl_getline_needs_run_time_check = yes; then
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| 29 | AC_CACHE_CHECK([for working getline function], am_cv_func_working_getline,
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| 30 | [echo fooN |tr -d '\012'|tr N '\012' > conftest.data
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| 31 | AC_TRY_RUN([
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| 32 | # include <stdio.h>
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| 33 | # include <stdlib.h>
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| 34 | # include <string.h>
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| 35 | int main ()
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| 36 | { /* Based on a test program from Karl Heuer. */
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| 37 | char *line = NULL;
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| 38 | size_t siz = 0;
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| 39 | int len;
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| 40 | FILE *in = fopen ("./conftest.data", "r");
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| 41 | if (!in)
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| 42 | return 1;
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| 43 | len = getline (&line, &siz, in);
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| 44 | exit ((len == 4 && line && strcmp (line, "foo\n") == 0) ? 0 : 1);
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| 45 | }
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| 46 | ], am_cv_func_working_getline=yes dnl The library version works.
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| 47 | , am_cv_func_working_getline=no dnl The library version does NOT work.
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| 48 | , dnl We're cross compiling. Assume it works on glibc2 systems.
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| 49 | [AC_EGREP_CPP([Lucky GNU user],
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| 50 | [
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| 51 | #include <features.h>
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| 52 | #ifdef __GNU_LIBRARY__
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| 53 | #if (__GLIBC__ >= 2)
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| 54 | Lucky GNU user
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| 55 | #endif
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| 56 | #endif
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| 57 | ],
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| 58 | [am_cv_func_working_getline=yes],
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| 59 | [am_cv_func_working_getline=no])]
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| 60 | )])
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| 61 | fi
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| 62 |
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| 63 | if test $am_cv_func_working_getline = no; then
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| 64 | dnl We must choose a different name for our function, since on ELF systems
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| 65 | dnl a broken getline() in libc.so would override our getline() in
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| 66 | dnl libgettextlib.so.
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| 67 | AC_DEFINE([getline], [gnu_getline],
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| 68 | [Define to a replacement function name for getline().])
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| 69 | AC_LIBOBJ(getline)
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| 70 |
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| 71 | gl_PREREQ_GETLINE
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| 72 | fi
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| 73 | ])
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| 74 |
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| 75 | # Prerequisites of lib/getline.c.
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| 76 | AC_DEFUN([gl_PREREQ_GETLINE],
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| 77 | [
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| 78 | gl_FUNC_GETDELIM
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| 79 | ])
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